Adapter from 1.25" to 1" needed

[sathya]

The immersion heater element in a hot water tank stopped when the wires got wet due to a leak. The supplier has no replacement and it's out of warranty anyway. I bought a new element on Ebay listed as 1" which is the diameter of the old one (I am using a 1" PVC plug until I get a replacement element). The part was listed as 1" but it is really 1" NPSM, which is 1-1/4" (1.25") as near as I can measure it. I doubt that an adapter from 1.25" (female) to 1" (male) exists, but am asking here as I have not found one elsewhere. An adapter could be metal or PVC. I am trying to get an adapter rather than try to exchange, as I am out of the USA and cannot easily return or receive a new heater element.
Photo shows new element on left, old one on the right
Thanks for any tips...

 

[Reach4]

If those are US threads, the one on the left appears to be "1 inch" NPT . http://www.engineeringtoolbox.com/npt-national-pipe-taper-threads-d_750.html

The nominal NPT numbers were based on ID at some point, although the actual ID varies for different pipes.

 

[Sponsor]

 

[sathya]

If those are US threads, the one on the left appears to be "1 inch" NPT . http://www.engineeringtoolbox.com/npt-national-pipe-taper-threads-d_750.html

The nominal NPT numbers were based on ID at some point, although the actual ID varies for different pipes.

The label says 1"NPSM and measures 1.25"

 

[hj]

The "old" one has is a proprietary item and is probably only available from the heater company. The new one appears to be have the more common 1" IPS thread. But, NEITHER of them seals with the thread the way a plug would. They use a gasket above the thread to seal.

 

[sathya]

Yes, I think you are correct. Not possible to find...